Derrick



(No Mqdel.) v 2 Sh eetsSheet 1.

G. ROUNDS.

DERRICK.

No. 350,213. Patented Oct. 5, 1886.

(No Model.) .2 Sheets-Shet 2'.

G. ROUNDS.

DERRICK. No. 350,213.

tail showing the attachment and UNITED STATES PATENT O FICE.

GEORGE ROUNDS, or VALLEJO, CALIFORNIA.

DERRICK.

SPECIFICATION forming part of Letters Patent No. 350,213, dated (Jctobr5, 1886.

; Applieatio n filed m 2, 1886.

Serial Nb. 201.994. .(Xo model.)

To all whom it may concern:

Be it known that I, GEORGE RoUNDs, of Vallejo, county of Solano, andState of Galifornia, have invented an Improvement in Derricks; and Ihereby declare the following to be a full, clear, and exact descriptionthereof. I

U y invention relates to the class of derricks,

mechanism by which the legs are raised and lowered, and limiting stopsfor the single leg, all of which I shall hereinafter fully describe. Theobject of my invention is to providea derrick which is simple and' cheapin construc-' tion, and so arranged that it can be readily raised andlowered with but theexerciseof a small amount of power; 4

Referring to the accompanying drawings, Figure l is a View of myderrick, showing it when lowered. Fig. 2 is aperspecth e View of thesame, showing it raised. Fig. 3 is a de guidance of the hoisting-rope G.

A is thebed,of any suitable character,such as is usually employed forderrioks. B is one of the legs, 0 is another, and D is the third. Thelegs B and G converge upwardly and are united at their tops rigidly andpermanently, so that said legs practically form a single pair operat ingtogetherL The lower ends or feet of these legs are hinged at the pointsb a, respectively, to the bed. The leg Dis a single one, and has itsfoot or lower end pivoted or hinged to the bed at the point (I, whichsaid point is in the extended center plane between the pivot-points ofthe other legs. The top of the leg D is fitted beween the tops of thelegs B and C, and

is guided accurately in its movements by the parallel spacedguide-strips E, which are secured to the legs 13 and C at their tops,and to a cross-bar, e, exteudingbetween said legs at a point lower down.

F is a cord or rope secured at its upper end to the upper end of thelegD, and at its lower end to the foot of one of the pair of legs B C. Thiscord limits the upward movement of the single leg, allowing it to beelevated to the proper inclination and there stopping it.

G is thehoisting-rope ol' the block-a11d-tackle mechanism. This issecured at one end at the point 9 to the top or head of the single legD. It thence passes to a block, H, of the legs-B C, thence back again toa block, h, in the. head of the single leg, and down and out past theguide-pulley h in said head, and down to with in reach of the powerwhich is to be applied,usu ally horse-power. A cleat, I, is secured tothe foot of the leg D, and to this cleat the hoisting rope is attachedso as to hold the legs in an elevated position. v

The operation of the derrick is as follows: Supposing it to be in theposition shown in Fig. 1that is to say, lowered and the power is appliedto the end of the hoisting-rope G. The first eiiect o't' pulling on thisrope is to raise the single leg D until. limited by the rope or cord F.Continued pulling thereupon raises the pair of legs B C until their heador top bears against and is limited by the head or, top of the singleleg, when the derrickwill be in the position shown in Fig. 2. The ropeis then made fast to the cleat and the derrick is ready for use. Inlowering the derrick the rope is released, whereby'the pair of legs fallfirst until limited by any frame. The single leg now falls until itrests on the crossbar e. The single leg, is, as I have before stated,guided correctly in its movements bythe guide-bars I or strips E on thepair of legs, and these legs are also guided correctly by their barsslipping over the single leg. Thus all thelegs of the derrick workaccurately, and by reason of the block-and-tackle mechanism describedbut very small power is required to elevate them.

Having thus described my invention, whatI claim as new, and desire toprotect by Letters Patent, is

1. In a derrick, a pair oflegs hinged at their feet to the bed andunited at their tops, in combination with a single leg pivoted at itsfoot to the bed, and having its head playing and guided between the pairof legs, and a blockand-tacklemechanism secured to the heads of thelegs, whereby the legs are elevated, substa ntially as described.

2. In a derrick, the pair of legs B O, hinged at their feet to the bedand united at their tops, and the parallel spaced guide-bars E, carriedby said pair of legs, in combination with the single leg D, hinged atits base to the bed, and having its head playing and guided between thebars E of the pair of legs and a block-and-tackle mechanism for liftingsaid legs, substantially as described.

3. In a derrick, the pair of legs B G, hinged at their feet to the bedand united attheir tops, the parallel spaced guideba-rs E, carried bysaid legs, and the cross-bar e between the legs, in combinaiion with thesingle leg D, hinged at its foot to the bed, and having its headplayingand guided between the bars and limited by the crossbar, andblock-and-tackle mechanism for elevating said legs, substantially asdescribed.

4. In aderriek, the pair of legs B C, hinged at their feet to the bedand united at their tops, in combination with the single leg D, hingedat its foot to the bed and having its head playing between and guided bythe pair of legs, the cord or rope F, by which the upward motion of thesingle leg is limited, and

the block-and-tackle mechanism for elevating the legs, substantially asdescribed.

5. In a derrick, the pair of legs B O, hinged at their feet to the bedand united at their tops, the parallel spaced guide-bars E on said legs,and the cross-bar 6 between them, in combination with the single leg D,hinged at its foot to the bed, and having its head playing and guidedbetween the bars and limited by the cross-bar e, the cord or rope F,limiting the upward movement of the single leg, the hoisting-rope G ofthe tackle mechanism, and the blocks and guide-pulley in the heads ofthe legs, all arranged and adapted to operate substantia-lly as hereindescribed.

In witness whereof I have hereunto set my hand.

GEORGE ROUNDS.

Witnesses:

S. H. NOURsE, H. 0. LEE.

